5.6乘69.32+138.64乘0.05+693.2乘0.43怎麼簡算

5.6乘69.32+138.64乘0.05+693.2乘0.43怎麼簡算


這麼簡單的題都不會做
我來教你：
5.6X69.32+138.64X0.05+693.2X0.43
=5.6X69.32+69.32X2X0.05+69.32X10X0.43
=5.6X69.32+69.32X0.1+69.32X4.3
=69.32X（5.6+0.1+4.3）
=69.32X10
=693.2



簡算：32.4-12.4*1.8


既然是簡便方法，樓上兩位從32.4看出是18*1.8，有點難了點
32.4-12.4*1.8=32.4-12.4*（2-0.2）=32.4-12.4*2+12.4*0.2
=32.4-24.8+2.48
=（32.4+2.48）-24.8
=34.88-24.8=10.08



七分之六乘十三减12乘七分之六簡算數學大本10頁第二題第四小題


7
=——X12-七分之六X12+七分之六X1
6
=14-14+1
=0+1
=1

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